Effect of Heat Treatments on the Crack-Healing and Static Fatigue Behavior of Silicon Carbide Sintered with Sc2O3 and AlN

ABSTRACTThe static fatigue behavior of sintered Y2O3/A12O3-fluxed Si3N4 in air is controlled by slow crack growth or creep fracture. Partial devitrification of the amorphous grain boundary phase at 1000°C and 1100°C improves the static fatigue resistance with specimens surviving up to 1500 hrs. during stress rupture experiments. In this study the early stages of partial devitrification during static fatigue testing at 1000°C are investigated by conventional and analytical transmission electron microscopy with emphasis on nucleation and growth of δ-Y2Si2O7 and X1-Y2SiO5 and possible constraints from different stress states. The results show that the stress state does not affect the nature of the secondary phase assemblage. However, the amount of crystallization is higher within the tensile region of the flexural specimens than in areas which experienced compressive stresses.

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Fatigue Behavior of Silicon Carbide Fiber Reinforced Lithium-Alumino-Silicate Glass-Ceramics

Tailoring Multiphase and Composite Ceramics ◽

10.1007/978-1-4613-2233-7_45 ◽

1986 ◽

pp. 561-570 ◽

Cited By ~ 14

Author(s):

Eric Minford ◽

Karl M. Prewo

Keyword(s):

Silicon Carbide ◽

Silicate Glass ◽

Fatigue Behavior ◽

Glass Ceramics ◽

Silicon Carbide Fiber ◽

Fiber Reinforced ◽

Alumino Silicate

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Proposed Theory for the Static Fatigue Behavior of Brittle Ceramics

Ultrafine-Grain Ceramics ◽

10.1007/978-1-4684-2643-4_14 ◽

1970 ◽

pp. 297-315 ◽

Cited By ~ 5

Author(s):

D. P. H. Hasselman

Keyword(s):

Fatigue Behavior ◽

Static Fatigue

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The influence of high R ratio on unnotched fatigue behavior of 1045 steel with three different heat treatments

International Journal of Fatigue ◽

10.1016/s0142-1123(02)00116-0 ◽

2003 ◽

Vol 25 (3) ◽

pp. 191-200 ◽

Cited By ~ 24

Author(s):

M Karadag ◽

R.I Stephens

Keyword(s):

Fatigue Behavior ◽

Heat Treatments ◽

R Ratio ◽

1045 Steel

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Microwave Crack-Healing Capability on Asphalt Mixtures with Silicon Carbide

10.1007/978-3-030-46455-4_170 ◽

2021 ◽

pp. 1335-1341

Author(s):

Alvaro González ◽

Jonathan Valderrama ◽

José Norambuena-Contreras

Keyword(s):

Silicon Carbide ◽

Asphalt Mixtures ◽

Crack Healing

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Static Fatigue of SiC Multifilament Tows at Temperatures up to 1200 °C in Air

Ceramics ◽

10.3390/ceramics2030033 ◽

2019 ◽

Vol 2 (3) ◽

pp. 426-440 ◽

Cited By ~ 2

Author(s):

Jacques Lamon

Keyword(s):

High Temperatures ◽

Fatigue Behavior ◽

Slow Crack Growth ◽

Stress Rupture ◽

Constant Load ◽

Rupture Time ◽

Static Fatigue ◽

Probability Relation ◽

Time Relation ◽

Increasing Temperature

SiC-based fibers are sensitive to delayed failure under constant load at high temperatures in air. Static fatigue at intermediate temperatures < 800 °C was attributed to slow crack growth from flaws located at the surface of fibers, driven by the oxidation of free carbon at grain boundaries. The present paper examines the static fatigue behavior of SiC-based Hi-Nicalon fibers at high temperatures up to 1200 °C and Hi Nicalon S fibers at intermediate temperatures (500–800 °C). The degradation of stress- rupture time relation of multifilament tows with increasing temperature was investigated. Predictions of tow lifetime based on critical filament-based model of tow failure were compared to experimental stress-rupture time diagrams. Critical filaments are characterized by strength–probability relation. The critical filament-based model was found to describe satisfactorily the static fatigue behavior of fiber tows at these temperatures. The influence of various factors on lifetime as well as the origins of variability is analyzed.

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